Am 27.09.22 um 19:24 schrieb Arvind Yadav:
Fence signaling must be enabled to make sure that
the dma_fence_is_signaled_locked() function ever returns true.
Since drivers and implementations sometimes mess this up,
this ensures correct behaviour when DMABUF_DEBUG_ENABLE_SIGNALING
is used during debugging.
This should make any implementation bugs resulting in not
signaled fences much more obvious.
Are all IGT tests now passing with this? That would be a bit unfortunate
because it means we still have missed the bug in drm_syncobj.
Christian.
Signed-off-by: Arvind Yadav <Arvind.Yadav@xxxxxxx>
---
include/linux/dma-fence.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 775cdc0b4f24..5156dc6be0a6 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -398,6 +398,11 @@ void dma_fence_enable_sw_signaling(struct dma_fence *fence);
static inline bool
dma_fence_is_signaled_locked(struct dma_fence *fence)
{
+#ifdef CONFIG_DMABUF_DEBUG_ENABLE_SIGNALING
+ if (!test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags))
+ return false;
+#endif
+
if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
return true;
